Accumulation of wealth by the super rich has little to do with stock prices going up. But if that is your claim, you need to do more than state it. You need to show me studies that happen to support your claim.
You want evidence that the majority of wealth held by the super rich is in stocks? What else would it be in? Of course real estate is a major major investment for most wealthy people. But it pales in comparison to stocks.
https://www.investopedia.com/articl...1214/where-does-bill-gates-keep-his-money.asp
The accumulation of wealth by the super rich can be completely unrelated to increases in stock prices, even if they hold the majority of their wealth as stocks.
You can have a million dollar portfolio because you bought $1,000 of stocks which then increased in value to $1m; OR because you bought $850,000 of stocks which then increased in value to $1m.
Only in the former case is the majority of the wealth due to increasing stock prices; But in both cases, the majority of the wealth is held as stocks.
You are rebutting a different claim from the one made.